A client who is admitted with late symptoms of HIV disease is receiving zidovudine 0.2 grams every 4 hours. The medication is provided in suspension of 50 mg per 5 mL. How many mL should the nurse administer? (Enter numeric value only.)

Calculation: Desired dose = 0.2 grams. Convert the desired dose from grams (g) to milligrams (mg) to match the available concentration's unit. 1 gram = 1000 mg, Desired dose in mg = 0.2 g × 1000 mg/g = 200 mg. Identify the available concentration. Available is 50 mg per 5 mL. = 50 mg / 5 mL = 10 mg/mL. Calculate the volume to administer. Volume (mL) = Desired dose (mg) / Concentration (mg/mL) = 200 mg / 10 mg/mL = 20 mL.